"I always try to sleep for at least eight hours a night and, of course, water, water, water! I drink 100 ounces of Smartwater every day," Jennifer Aniston says. "But occasionally I just have to have a Diet Coke—there's nothing like it!"Calculate your sleep needs.

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What's your best health tip?

"I always try to sleep for at least eight hours a night and, of course, water, water, water! I drink 100 ounces of Smartwater every day," Jennifer Aniston says. "But occasionally I just have to have a Diet Coke—there's nothing like it!"Calculate your sleep needs.

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You're famous for loving yoga. Why are you such a fan?

"Oh gosh, I noticed dramatic changes in my body after I started doing yoga, but I also think you have to shake things up," says Aniston. "I have a Spin bike, an elliptical, and a treadmill, and I do cardio for at least 20 minutes a day. Even that short burst makes a difference."

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What’s your emergency 10-minute workout?

"The best quick sweat for me is getting on the Spin bike. I can take it uphill, I can take it downhill, I can sprint," Jennifer Aniston says. "And it's great when I need to make phone calls. I put on what I call my Janet Jackson headpiece, and I'm set."Try this one-minute workout plan.

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Do you take days off from exercise?

"Of course I do! It's important to rest the body," Aniston insists. "I can go a whole week saying, 'I'm not going to work out.' Your body will tell you what it needs."

"It's a romantic idea of mine," Aniston admits. "Do I do it often? Absolutely not! But when I do, I like simple things. The other night I made steak, grilled vegetables and a Greek salad. Soup is another healthy snack. I get recipes from The Family Chef. My favorite right now is celery-broccoli-zucchini with basil."

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You turned 41 this year. What's different about your body now?

"I'm sprouting more than one wonderful grey hair. My colorist gets creative with what I call my natural highlights!" Jennifer Aniston says. "I've always worn glasses for distance, but right when I turned 40, I was reading something and actually had to pull it away from my eyes and get my prescription changed."

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What's your favorite workout music?

"I listen to Lady Gaga's 'Paparazzi' and 'Just Dance' when I Spin, and the band 1 Giant Leap during yoga," Jennifer Aniston says.